Improvement in lifting-jacks



W. F. ARNOLD.

Lifting-Jacks.

Patented Jan.7,1873.

UNITED STATES PATENT OFFICE.

\VILBUR F. ARNOLD, OF NEW BRITAIN, CONNECTICUT.

IMPROVEMENT IN LlFTlNG-JACKS.

Sp: cification forming part of Letters Patent No. 134,625, dated January 7, 1873.

To all whom it may concern:

Be it known that I, WILBUR F. ARNOLD, of New Britain, in the county of Hartford and State of Connecticut, have invented certain Improvements in Lit'ting Jacks, of which the following is a specification:

My invention consists in the peculiar combination of parts, as hereafter described.

In the accompanying drawing, Figure 1 is a side elevation of a lifting-jack which embodies my invention; and Fig. 2 is a centra-lvertical section of the same.

A designates an upright or standard, mounted upon any suitable base B, and provided with a handle, C, at its upper end. I prefer to make the standard A of wrought-iron tubing. 1 fit two sliding sleeves, D D, upon this round standard A, and prevent them from turning thereon by means of the rack 11. The upper sleeve D is provided with an arm, E, on which to support the axle d of the carriage when the jack is applied for use. The two sleeves D D are connected together by a lifting-lever, F, and short lever G, so pivoted together as to form a toggle-joint. The sleeve 1) is provided with a pawl, c, which engages with teeth formed in the lower end of the rack' b. The outer end of the pawl c is made heavy, so as to cause it to engage with the rack by its own gravity; but, if desired, it may be operated with a spring.

The operation is as follows: The jack is placed under the axle, the lifting-lever elevated, and then with the two sleeves it is raised until the arm E strikes the axle d, as shown in Fig. 1, when the pawl 0 will hold the lower sleeve D in its place. ,The lifting-lever is then depressed, which will raise the upper sleeve D, straighten the toggle-joint, and -shol d the axle in its elevated position, as shownin Fig. 2.

It is, of course, evident that in case the lower sleeve D were rigidly affixed to the stand ard A the operation of all the other parts would be the same as now shown and described, except their adjustability.

By my invention I produce a lifting-jack which is very compact,is veryreadily adjusted to axles of difl'erent heights, and can, be produced at a small cost.

I claim as my invention 1. The combination of the standard A and sleeve. D, with the toggle-joint formed by the levers F G, all substantially as and for the purpose described.

2. The combination of the two movable and adjustable sleeves D D, rack b, pawl c, levers F G, and standard A, all operating together substantially as and for the purpose described.

WILBUR F. ARNOLD.

Witnesses:

EDWARD A. PALMER, JAMES SHEPARD. 

